Construct an equation for the expression: the sum of a number and itself is 8. show the solution to the equation and prove your solution to be true through your work.

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equation : 2x = 8

solution : x = 4

Step-by-step explanation:

let the number be x

"the sum of a number and itself "

= sum of x and x

= x + x

= 2x

"the sum of a number and itself  is 8"

2x = 8

solving the equation, divide both sides by 2

2x = 8

x = 8/2

x = 4

30 feet

step-by-step explanation:

that would be 2 1/2 * 12

= 24 + 6

= 30 feet   (answer)

d. 145*2 is 290 than the total angle is 360 then minus 290 then divide by two